Trapping of Magnetic Flux in Bi-2223 Ceramic Superconductors Doped with α-Al2O3 Nanoparticles
Abstract: By combining experimental results and a simple model, we offer here an explanation for the role played by the low-angle grain boundaries and the doping with α-Al2O3 nanoparticles in the trapping of the magnetic flux in Bi1.65Pb0.35Sr2Ca2Cu3O10+δ (Bi-2223) ceramic samples. Our model correlates the size of the nanoparticles, properties of the superconducting matrix, and the magnetic flux trapped at the intragranular planar defects, the so-called Abrikosov-Josephson vortices. The results indicate that the role played by the doping with α-Al2O3 nanoparticles is to pin the AJ vortices at the grain boundaries with misorientation angles θ∼10∘. We also argue that a similar procedure for identifying conditions for the trapping of the magnetic flux may be applied to other superconducting materials doped with non-magnetic nanoparticles.
Author(s): Hernández-Wolpez, M.; Gallart-Tauler, P. R.; García-Fornaris, I. ; Govea-Alcaide, E.; Pérez-Tijerina, E. ; Jardim, R. F.; Muné, P.
Journal of Superconductivity and Novel Magnetism
Published: 05 September 2019 33, 675–682 (2020)
